For ignition energy effect, results from methane/niacin mixture demonstrated that the MEC and LFL will not be affected by changing ignition energy.
New rapid compression machine (RCM) data are obtained for the purpose of further validating the binary fuel model, identifying reactions important to low-temperature propane and DME oxidation, and understanding the ignition-promoting effect of DME on propane.
The results show that the ignition-promoting effect of hydrogen is mainly the result of the increase in end-gas temperature and pressure, while addition of ethane and propane promotes ignition primarily by changing the chemical autoignition behavior of the fuel itself.
Radical adsorption/desorption reactions hindered the onset of homogeneous ignition and this effect was more pronounced at 1 bar.
Turning the ignition had no effect, so the driver tried a bump start, letting us roll backwards down the bumpy road towards the hairpin bend and the 500m drop below, then slamming the bus into reverse with a mighty jolt that made my head throb still harder.
Lastly, to assess the importance of blending effects, ignition delay times of fuel blends measured experimentally were compared against times calculated using a linear combination method (i.e. superposition of constituent-fuel ignition delay times).
Thermal heating, regardless of source, appears to be the dominant mechanism responsible for ignition and photochemical effects appear to be negligible in the ignition of the materials considered in this study.
This was not the case for N2, C2HF5, and C3HF7, which tended to have little effect on ignition unless very high agent concentrations were present, when ignition was not achieved.
The relative importance of the two effects changes dynamically in time, and, beyond some instant after ignition, the spray evaporation effect is completely dominant, causing flame acceleration for any Lewis number, in sharp contrast to the behavior of an equivalent gaseous flame.
The effect of ignition location was also investigated for stoichiometric air-fuel conditions with ignition at the closed end of the reactor producing a significant increase in burning velocities on the order of 2 4 times faster as the diameter of the reactor was increased.
